Patio umbrella



FIG. 1 is a perspective view of a patio umbrella;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof.

The broken lines are for illustrative purposes only and form no part ofthe claimed design.

I claim the ornamental design for a patio umbrella, as shown.